If you're talking about the 'swap file' or virtual memory (vm), it's easiest to let the system decide what's best. Btw, this is irrespective of the the hard drive's built-in cache/buffer that's independent of virtual memory I think.

Or, manually set a vm figure that's equal to 1.5 times your system RAM. I wouldn't set it to more than 2Gb though, no matter how much system RAM you have. G

What I mean is, for example win98 you could class the machine as a network server and it would allocate more SYSTEM memory (not virtual)to caching hard drive data,with hard drives having their own large & fast cahes is it still nesessary to have the O.S allocate memory or do the two not relate to each other?